An approach for evaluating the hydrological effects of urbanization and its application

Cheng, Shin-jen; Wang, Ru-Yih

doi:10.1002/hyp.350

Cited by 94 publications

(104 citation statements)

References 25 publications

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“…The changes in extreme high-flow conditions varied from 7 % for the 1-day maximum and 2-day maximum to 4 % for the 90-day maximum flow conditions for the agricultural scenario (L1). The results are in agreement with those of Cheng and Wang (2002), Choi and Deal (2008) and Choi (2008). The timings of annual extreme flows were similar for the base scenario and the extensive agriculture scenario; however, the timings shifted from mid-July for base scenario and agriculture (L1), to beginning and mid-January for urbanization scenarios.…”

Section: Hydrologic Alterationsupporting

confidence: 87%

Hydrologic impacts of climate and land-use change on Namnam Stream in Koycegiz Watershed, Turkey

Baloch

Ames

Tanık

2014

Int. J. Environ. Sci. Technol.

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The effects of land-use and climate change on the hydrologic regime of the Namnam Stream in the Koycegiz Watershed, Turkey, are quantified using a hydrologic simulation modeling system under a number of real and potential scenarios. The study shows that urbanization has induced severe modification in the magnitude, frequency, and duration of extreme flow conditions. The mean annual flows increased by 5-60 % due to 0.1-50 % increase in impervious surfaces. Additionally, confounding climate change impacts include an increase in low flow pulses of 2 % when considering a decrease in precipitation by 20 % and a decrease in low flow pulses of 12 % when considering a 20 % increase in precipitation. The watershed system under investigation is significantly more sensitive to climate change scenarios involving additional inputs of precipitation compared with scenarios involving reductions in precipitation and that these changes are compounded in the presence of major land-use change. These results suggest the need for erosion control, nutrient management and habitat conservation in light of rapid urbanization, as often typified in developing countries, and potential climate change to conserve essential watershed functions.

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Section: Hydrologic Alterationsupporting

confidence: 87%

Hydrologic impacts of climate and land-use change on Namnam Stream in Koycegiz Watershed, Turkey

Baloch

Ames

Tanık

2014

Int. J. Environ. Sci. Technol.

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“…The study is consistent with several previous studies which highlighted the significant increases in urban growth and its effect on runoff production [10,20,[37][38][39][40][41]. The hydrological processes, over a range of temporal and spatial scales, are impacted by land use changes [21,42,43].…”

Section: Discussionsupporting

confidence: 90%

“…Urban expansion also leads to the removal of trees and vegetation, causing a decrease in evapotranspiration. The construction of roads and culverts has effects which may include reduction of infiltration, decline in the groundwater table, increased surface runoff and a reduction of base flows [5,10,11]. Built-up areas lead to an increase in impervious surfaces which in turn reduces the runoff concentration time.…”

Section: Introductionmentioning

confidence: 99%

Estimating the Effect of Urban Growth on Annual Runoff Volume Using GIS in the Erbil Sub-Basin of the Kurdistan Region of Iraq

Hameed

2017

Hydrology

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Abstract:The growth and spread of impervious surfaces within urbanizing catchment areas pose signiificant threats to the quality of natural and built-up environments. Impervious surfaces prevent water infiltration into the soil, resulting in increased runoff generation. The Erbil Sub-basin was selected because the impervious cover is increasing rapidly and is affecting the hydrological condition of the watershed. The overall aim of this study is to examine the impact of urban growth and other changes in land use on runoff response during the study period of 1984 to 2014. The study describes long-term hydrologic responses within the rapidly developing catchment area of Erbil city, in the Kurdistan Region of Iraq. Data from six rainfall stations in and around the Erbil Sub-basin were used. A Digital Elevation Model (DEM) was also used to extract the distribution of the drainage network. Historical levels of urban growth and the corresponding impervious areas, as well as land use/land cover changes were mapped from 1984 to 2014 using a temporal satellite image (Landsat) to determine land use/land cover changes. Land use/land cover was combined with a hydrological model (SCS-CN) to estimate the volume of runoff from the watershed. The study indicates that the urbanization of the watershed has increased the impervious land cover by 71% for the period from 1984 to 2004 and by 51% from 2004 to 2014. The volume of runoff was 85% higher in 2014 as compared to 1984 due to the increase in the impervious surface area; this is attributed to urban growth. The study also points out that the slope of the watershed in the Erbil sub-basin should be taken into account in surface runoff estimation as the upstream part of the watershed has a high gradient and the land is almost barren with very little vegetation cover; this causes an increase in the velocity of the flow and increases the risk of flooding in Erbil city.

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“…(e.g. Rose and Peters, 2001;Cheng and Wang, 2002;Du et al, 2012;Huang et al, 2008). However, several studies have found mixed effects of urban-ization on peak flows and response times, associated with a combination of imperviousness and flood mitigation measures, especially for basins where urbanization has predominantly taken place after implementation of stormwater control legislation (e.g.…”

Section: Introductionmentioning

confidence: 99%

The role of storm scale, position and movement in controlling urban flood response

Veldhuis

Zhou

Yang

et al. 2018

Hydrol. Earth Syst. Sci.

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Abstract. The impact of spatial and temporal variability of rainfall on hydrological response remains poorly understood, in particular in urban catchments due to their strong variability in land use, a high degree of imperviousness and the presence of stormwater infrastructure. In this study, we analyze the effect of storm scale, position and movement in relation to basin scale and flow-path network structure on urban hydrological response. A catalog of 279 peak events was extracted from a high-quality observational dataset covering 15 years of flow observations and radar rainfall data for five (semi)urbanized basins ranging from 7.0 to 111.1 km 2 in size. Results showed that the largest peak flows in the event catalog were associated with storm core scales exceeding basin scale, for all except the largest basin. Spatial scale of flood-producing storm events in the smaller basins fell into two groups: storms of large spatial scales exceeding basin size or small, concentrated events, with storm core much smaller than basin size. For the majority of events, spatial rainfall variability was strongly smoothed by the flowpath network, increasingly so for larger basin size. Correlation analysis showed that position of the storm in relation to the flow-path network was significantly correlated with peak flow in the smallest and in the two more urbanized basins. Analysis of storm movement relative to the flow-path network showed that direction of storm movement, upstream or downstream relative to the flow-path network, had little influence on hydrological response. Slow-moving storms tend to be associated with higher peak flows and longer lag times. Unexpectedly, position of the storm relative to impervious cover within the basins had little effect on flow peaks. These findings show the importance of observation-based analysis in validating and improving our understanding of interactions between the spatial distribution of rainfall and catchment variability.

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An approach for evaluating the hydrological effects of urbanization and its application

Cited by 94 publications

References 25 publications

Hydrologic impacts of climate and land-use change on Namnam Stream in Koycegiz Watershed, Turkey

Hydrologic impacts of climate and land-use change on Namnam Stream in Koycegiz Watershed, Turkey

Estimating the Effect of Urban Growth on Annual Runoff Volume Using GIS in the Erbil Sub-Basin of the Kurdistan Region of Iraq

The role of storm scale, position and movement in controlling urban flood response

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